Cleaned out

The elven elder exclaimed, his ethereal form shimmering as if rocked by an invisible force. "You've gained an insight into the Frost Arcane Slash in mere hours? That took me decades to accomplish!"

The ethereal form of the elf faded in and out as if struggling to stay visible. This was an unimaginable phenomenon, beyond his anticipation. 

He had assumed that the human would need at least a couple of years to even comprehend such a skill, fully digesting the image of what he saw.

However, here was this young man, not even a few decades old, who had managed to not only replicate the slash but gain an insight into the essence of it in a fraction of the time.

Just who was this human being? Perhaps he had underestimated him? Could he be some hidden powerhouse from an A-ranked world?

Liam, entirely unaware of the elven elder's shock, continued his relentless practice.